Vibratory plow

ABSTRACT

A vibratory plow adapted to be removably mounted to a prime mover in the form of a conventional digger or trencher such that the plow is driven off of the main drive sprocket or power takeoff of the prime mover thereby eliminating any necessity for an auxiliary power takeoff. The plow comprises a hollow mounting shaft adapted to be telescopically arranged relative to the tail stock of the prime mover and further including a driving assembly which in turn is movably connected to a yoke assembly. Driving of the drive assembly by a drive chain causes reciprocal or oscillating movement of the yoke assembly and the tunnel forming assembly attached thereto, in a substantially horizontal direction. A tunnel is thereby formed by a bullet and interconnecting blade member positioned in operative relation below the surface of the ground. Means to connect a cable or pipe being pulled by the plow is movably connected to the tunnel forming assembly.

United States Patent [191 Hughes et al.

[ VIBRATORY PLOW [76] Inventors: Robert E. Hughes, 5609 Northfield Rd., Bethesda; Emmert K. Walker, 335 Scott Dr., Silver Springs, both of Md.

[22] Filed: Apr. 26, 1971 [21] Appl. No.: 137,141

MacLay 61/726 [451 Aug. M, 1973 Primary Examiner-Jacob Shapiro Attorney-Stefan M. Stein A vibratory plow adapted to be removably mounted to a prime mover in the form of a conventional digger or trencher such that the plow is driven off of the main drive sprocket or power takeoff of the prime mover thereby eliminating any necessity for an auxiliary power takeoff. The plow comprises a hollow mounting shaft adapted to be telescopically arranged relative to the tail stock of the prime mover and further including" a driving assembly which in turn is movably connected to a yoke assembly. Driving of the drive assembly by a drive chain causes reciprocal or oscillating movement of the yoke assembly and the tunnel forming assembly attached thereto, in a substantially horizontal direction. A tunnel is thereby formed by a bullet and interconnecting blade member positioned in operative relation below the surface of the ground. Means to connect a cable or pipe being pulled by the plow is movably connected to the tunnel forming assembly.

113 Clainrns, 6 Drawing Figures PAIENIEU 131M975 3.751 .928

FIG-5 II/[s16 INVENTOR. ROBERT E. HUGHES BY v E ATZD RNEY.

VIBRATORY PLOW BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a vibratory plow in the form of an attachment which may be either removably integrally attached to a prime mover and which is designed to form a tunnel beneath the surface of the ground by virtue of horizontal motion of a tunnel forming element, in a substantially horizontal direction, for the purpose of laying pipes, cables or the like.

2. Description of the Prior Art This invention relates to a device for positioning pipes, conduits, telephone and electric cables and other type service cables below the surface of the ground. Modern day techniques in the construction industry have all, but eliminated the positioning of service cables and the like above ground on service poles. This has been done for esthetic as well as safety reasons since it is well known that cables mounted on service poles frequently are ripped down during adverse weather conditions. This has been known to cause severe damage both to property and people. The placing of service cables beneath the surface of the ground has caused the elimination of unslightly service poles and has insured constant, efficient operation even through the worse weather conditions.

Prior art means for the placing of service cables beneath the ground have included digging of a trench, and backfilling the same after the cables or conduit have been laid therein. These rather antiquated techniques were both time consuming and relatively expensive because of both the time and complex machinery involved. The complexity of the machinery has also resulted in a number of functional limitations which have affected the locations in which service cables may be laid and the amount of time involved in laying such cables. Other disadvantages associated with prior art devices include the restoration of the ground surface above the buried cable which has previously necessitated the planting of grass or the performing of other cosmetic measures in the back fill area.

In an attempt to overcome the above noted prob lems, a number of plows have been designed and are presently in existence which are intended to progressively slit the earth thereby producing slit type trenches, wherein very little earth is removed from the area of the ground below which the surface cable is being placed. Such plows are usually pulled by prime movers in the form of conventional trenchers or diggers since the effort required to pull such plows is great and suffieient traction of the prime mover must be provided. In an effort to reduce the power required to pull these plows and in an attempt to more efficiently form the tunnel, below the surface of the ground, in which the service cables are being placed, the tunnel forming elements of the'plows have been provided with a reciprocating motion. This reciprocating oscillating movement of the tunnel forming element of the plow greatly improves the procedure for forming the tunnel itself. However, the relatively complex machinery utilized to date to accomplish this reciprocating motion has generally been unsatisfactory. This machinery, because of its complexity, has been found to be very expensive and because of the amount of violent vibration to which the machinery is being subjected, breakdown of the machinery isa common occurrence. In an attempt to overcome the maintenance problem associated with a vibrating machine the prior art devices have become even more complex thereby adding to the expense without satisfactorily eliminating the maintenance problem.

Because of the great expense associated with this type of machinery, the user of diggers, trenchers and vibratory plows of this nature require a machine having much greater versatility than any machines presently available on the market.

Included in the reasons why the prior art machines are not as versatile as desired is due to the relatively great length of time needed to install machines of this nature in operative relation on a prime mover. Generally speaking it often takes three or four hours and relatively large number of workers to operatively install these machines. Also the majority of these devices require auxiliary power takeoffs in that these devices are unable to be driven off the main drive sprocket of the prime mover.

All of the above problems prevalent in the prior art devices render conventional prior art machines expensive, time consuming to operate and install and undependable from a maintenance standpoint.

SUMMARY OF THE INVENTION This invention relates to a vibratory plow device which is designed to form a tunnel below the surface of the ground and lay pipes, conduits, service cables or the like therein. This device is primarily designed to be used in connection with a prime mover such as a conventional digger or trencher or like machine. This device may be removably mounted on a mounting boom attachable to the tail stock of the prime mover. Alternately, the device may be mounted on the prime mover so as to be an integral part thereof.

More specifically, this invention relates to a vibratory plow including a hollow mounting shaft which may be telescopically arranged about the boom of the prime mover and which has the drive assembly connected to the end of the shaft by means of a drive shaft supporting means. This supporting means is fixedly attached to the extremity of the shaft and comprises a pair of plates wherein the drive assembly is arranged in sandwichedlike fashion between these plates. The drive assembly itself is driven by main driving means including a main drive chain which connects directly to a main drive sprocket included on the primary power takeoff of the prime mover. The drive chain is connected so as to drive the main drive shaft by means of a sprocket wheel fixedly attached thereto. A plurality of roller sprockets are also attached to the main drive shaft and serve to drive a second, eccentric drive shaft by means of cooperatively positioned roller sprocket which connect to the main drive shaft by connecting chain means. The main drive shaft is rotationally mounted on the support means and the eccentric drive shaft is movably connected both to the drive assembly support means and to a yoke assembly such that the yoke assembly is moved in a reciprocal, oscillating fashion relative to the drive assembly support means. This oscillating motion of the yoke assembly further serves to oscillate, in a similar direction, a tunnel forming assembly fixedly attached thereto.

While a preferred embodiment of the present invention has herein been described in terns of the main driving means comprising a drive chain and cooperative gearing sprocket wheels ctc., the driving means could alternatively comprise a drive belt, direct gearing and the like instead of the drive chain. In these alternate embodiments the connecting sprocket wheels associated with the drive chain are substituted by other equivalent gearing means.

The yoke assembly comprises a pair of channel plates arranged externally to and running essentially parallel with the side plates which make up the drive assembly support means. As described relative to these side plates, the channel plates are arranged to partially enclose the drive assembly. The upper extremities of the channel plate are each pivotally connected to a pivot rod which extends through and is fixedly attached to both of the side plates of the drive assembly support means. By virtue of the channel plates being connected to the eccentric drive shaft, rotation of this eccentric drive shaft cuases the yoke assembly to move relative to the side plates of the support means and pivot about the pivot rod. This forces the tunnel forming assembly to move in a reciprocal fashion in a substantially horizontal direction.

An alternate construction for the yoke assembly comprises an integrally formed cast housing having substantially the same structural elements of the above described yoke assembly. These structural elements such as the channel members, may or may not have substantially the same configuration as found to be most efficient.

The tunnel forming assembly comprises a bullet fixedly attached to the lower extremity ofa blade which serves to interconnect the bullet member of the yoke assembly. The upper extremity of the blade is removably attached to a base plate which is arranged in interconnecting relation between the lower extremity of the channel members.

As pointed out above, this device is primarily designed to position cable or the like within the tunnel formed by the oscillating motion of the bullet which is part of the tunnel forming assembly. The cable is positioned within the formed tunnel either by essentially dragging the cable behind the tunnel forming member or by progressively feeding the cable into the tunnel as it is formed. Accordingly, a connecting means is provided which serves to position the cable in a desired location in the formed tunnel. One embodiment of the present invention includes the connecting means as comprising a stud having an essentially hollow cavity formed therein and a rigid pin and ball member designed to move in a reciprocal fashion within the cavity. The opposite extremity of the pin is connected to a connecting member which attaches directly to the cable being positioned. As the bullet and connecting stud move in an oscillating fashion, in a horizontal direction, the ball and pin covers the length of the cavity thereby eliminating a sudden jerking force being applied to the cable being positioned.

Alternatively, a cable directing conduit may be movably attached to the non-oscillating side plates so that the cable is fed through the conduit into the formed tunnel in a continuous fashion as the tunnel is being formed. The cable directing conduit is arranged to extend along the length of the blade member and is attached to the device in such a manner so as to eliminate any jerking forces being applied directly to the cable as it is being positioned.

In operation, the removable vibratory plow device is readily attached to the prime mover simply by disconnecting the main drive sprocket, connecting the hollow mounting shaft in telescopic relation to the mounting boom of the prime mover and reconnecting the drive chain to the main drive sprocket of the prime mover and to the drive sprocket attached to the main drive assembly. The vibratory plow is then pivoted downward into ground penetrating, operative position dependent upon what level it is desired to form the tunnel. As the drive chain is driven by the main power takeoff of the prime mover, the drive assembly causes the yoke to oscillate in a horizontal direction which in turn causes the tunnel forming member and more precisely the bullet to oscillate in this same manner. As the tunnel is formed, the cable being positioned is either towed directly behind the bullet or fed continuously from above ground into the tunnel as it is being formed dependent upon the specific embodiment of the present invention which is being utilized.

The invention accordingly comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawing in which:

FIG. 1 represents an isometric view of the vibratory plow device of the present invention attached to a prime mover in the form of a conventional trencher or digger.

FIG. 2 is a more detailed isometric view of the assembly device showing the interior thereof and the drive assembly.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2.

FIG. 4 is a view of the vibratory plow with the tunnel forming assembly imbedded in the ground.

FIG. 5 is a sectional view of the tunnel forming assembly taken along lines 55 of FIG. 4.

FIG. 6 is a side sectional view of one embodiment of the tunnel forming assembly and connection means attached thereto.

Similar reference characters refer to similar parts throughout the several views of the drawings.

DETAILED DESCRIPTION This invention relates to a vibratory plow device generally indicated as 10 in FIGS. ll and 2 which is primarily designed to position pipes, conduit service cables or the like underground (FIG. 1 The plow 10 is designed to be removably connected to a prime mover 12 which may be in the form of a conventional digger or trencher. The plow 10 is removably attached to the prime mover 12 by means of a substantially hollow mounting shaft 14 designed to be telescopically mounted on the trail stock or mounting boom of the prime mover, indicated in broken lines as 16. Alternatively the plow may be bolted or other wise connected to the prime mover by applicable connecting means. The end of mounting shaft 14 not in engagement with boom 16 is securely attached by connecting means H8, or the like, to drive assembly support means in the form of side plates 20 and 22. These side plates are arranged in spaced, substantially parallel relation to one another and partially enclose the drive assembly generally indicated as 24.

The drive assembly includes a main drive shaft 26 having mounted thereon drive sprocket 28 and roller sprockets 30 and 32. Main drive shaft 26 is rotationally mounted at 34 to each of the side plates and is driven by sprocket 28 operatively engaging main drive chain 36. This drive chain 36 is designed to cooperate at its opposite end, (not shown) with the main drive sprocket of the prime mover thereby eliminating the necessity of providing an auxiliary power takeoff to run the drive assembly 24. The drive assembly further includes an eccentric drive shaft 38 having mounted thereon cooperating roller sprockets 40. and 42 arranged in cooperatively position with roller sprockets 30 and 32. These sets of roller sprockets are interconnected in driving relation by connecting chains 44 and 46 such that eccentric shaft 38 is rotated upon main drive shaft 26 being rotated by means of main drive chain 36. As clearly shown in FIG. 3, the eccentric drive shaft 38 is movably mounted relative to side plates and 22 and secured thereto by bearing blocks 48 which is in turn secured to plate 20 by fasteners 50 and locking ring 52. Each extremity of eccentric drive shaft 38 ends in nub 54 mounted in bearing race assembly 56. The bearing race assembly 56 cooperates with wear blocks 58 which are fixedly mounted relative to bearing assembly 56 movably mounted in operative engagement with channel member 60 of the yoke assembly generally indicated at 62 which is to be described hereinafter. As can be seen from the above description, the main drive chain 36 serves to rotate main drive shaft 26 which in turn drives eccentric drive shaft 38 which is movably mounted relative to both side plate 20 and channel member 60 of the yoke assembly. The. yoke assembly 62 includes a pair of channel members 60 and 61 mounted externally of side plates 20 and 22 respectively and extending in substantially parallel, spaced relation thereto. Base plate 64 is secured across the lower extremity of each channel member 60 and 61 and serves to mount the tunnel forming assembly generally indicated at 66 to the yoke assembly 62.'As shown in FIG. 2 the yoke assembly substantially surrounds the'drive assembly and the side plates 20 and 22 which comprises support means for the drive assembly. A pivot rod 68 is provided at the upper extremity of the yoke assembly and is removably attached as at 70 by any conventional type of bearing connection. The pivot rod further extends through apertures 72 and 74 in side plates 20 and 22 respectively and is thereby fixedly attached to the plates so as to provide a pivoting axis about which the yoke assembly 62 may pivot upon activation of the. drive assembly. It can be readily seen from the above description that the rotation of the eccentric drive shaft causes reciprocating, oscillating movement of yoke assembly 62 relative to the side plates 20 and 2 2 and the drive assembly 24. This reciprocating motion occurs in substantially horizontal direction.

Because of its rigid attachment to the base plate 64 the yoke assembly 62, the tunnel forming assembly 66 also moves in this reciprocating, oscillating manner in substantially horizontal direction as indicated by directional arrows 76 (FIG. 2). The tunnel forming assembly itself comprises a bullet member 78 interconnected to the bottom of the yoke assembly by means of cutting blade 80. Blade 80 has a tapered mount 82 secured to its upper extremity as shown in FIG. 2 which is designed to engage mounting jaws 84 thereby serving to securely fasten the tunnel forming assembly and more particularly blade 80 to yoke assembly 62.

Positioning of the cables or the like is accomplished by dragging the cable means 84 behind the bullet 78 (FIG. 1) by a connection means attached in interconnecting relation to the cable and bullet 78. One embodiment of this connection means is shown in FIG. 6 and comprises a stud 88 having a cavity 90 defined therein. A ball or like cavity transversing member 92 is designed to travel the length of cavity 98 and is rigidly attached to a pin 94 arranged in interconnecting relation between ball 92 and a connection member 96. The connection member 96 is attached directly to the cable means 84 by any applicable method. Movement of the ball 92, pin 94 and connection member 96 relative to stud 88 and bullet 78 takes up any adverse shock caused by the forward, periodic movement of the bullet 78 and the remaining portion of the tunnel forming assembly. This forward movement is indicated by directional arrow 98 (FIG. ll).

Alternatively, the cable means 84 may be continuously fed from a supply (not shown) down into the tunnel as it is being formed, as shown in FIG. 4. In this embodiment the blade 84 has removably attached thereto a cable directing conduit 100 arranged along the length and at the rear edge thereof (FIG. 5). It is important to note that the front or leading edge of blade 84 is somewhat sharper relative to the remaining thickness of the blade. In addition, conduit 100 should ideally be of a lesser thickness than the widest portion of blade 84 so that the travel of the blade through the ground will be efficiently accomplished with a minimum amount of drag. Referring specifically to FIGS. 4 and 5, the relative movement between conduit 100 and blade 80 prevents the forward jerking motion of the tunnel forming assembly to be transferred to the cable means as it is being progressively laid in the tunnel formed by bullet 78. This is true since the conduit moves forwardly in a relatively continuous fashion rather than having an oscillating motion applied to it, as with the bullet.

In operation, the vibratory plow device 10 is removably attached to the tail stock or mounting boom 36 of the prime mover by disconnecting main drive chain 36, fixing mounting shaft 14 over boom 16 and connecting the device thereto by any appropriate attachment means. A drive chain 36 is connected to sprocket 28 of the drive assembly. The entire unit is then pivoted down into ground engaging and penetrating position to a desired level to form a tunnel for laying cable means 84 (FIG. 1). Activation of the primary power takeoff causes drive chain 36 to drive the drive assembly 24 thereby causing horizontal, reciprocating motion of the yoke assembly 62 in a substantially horizontal direction asshown by directional arrow 76 in FIG. 2. As the prime mover moves forward, the bullet 78 of the tunnel forming assembly also moves forward as indicated by directional arrow 98 (FIG. 1) due to the forward oscillating motion transferred to the bullet from the yoke assembly 62. Depending upon the particular embodiment of the connection means associated with the tunnel forming assembly, the cable means 84 is either dragged through the tunnel as'it is formed or alterna tively fed into the tunnel on a continuous basis as it is being formed (FIG. 4).

It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Now that the invention has been described,

What is claimed is:

l. A vibratory plow attachable to the prime mover comprising, a mounting shaft, a drive assembly support means, a drive assembly connected to said mounting shaft by said support means, main driving means operatively interconnecting said drive assembly to the power takeoff of the prime mover, a yoke assembly pivotally mounted to said drive assembly support means, said drive assembly comprising a main drive shaft attached in driven relation to said main driving means, an eccentric drive shaft movably connected to said yoke assembly by a shaft connecting means, said shaft connecting means rotatably connected to said eccentric shaft and positioned in contiguous relation to said yoke assembly so as to be disposed in movable engagement therewith, whereby rotation of said eccentric shaft causes movement of said yoke assembly, said main drive shaft arranged in driving interconnecting relation between said main driving means and said eccentric shaft, said shaft connecting means disposed in interconnecting relation between said eccentric shaft and said yoke assembly, whereby said yoke assembly oscillates in a substantially horizontal direction upon activation of said drive assembly.

2. A vibratory plow as in claim 1 wherein said main driving means includes a drive chain, said drive assembly comprises roller sprocket wheel means connected to both said main drive shaft and eccentric drive shaft, connection means interconnecting in driving relation cooperating rollers sprocket wheel means of each drive shaft, whereby said yoke assembly is driven in reciprocal fashion by said drive chain through said main drive shaft and said eccentric drive shaft.

3. A vibratory plow as in claim 2 further comprising a main drive sprocket fixedly mounted on said main drive shaft and connected in direct driving relation to said drive chain such that said yoke assembly is driven in reciprocal fashion by said eccentric drive shaft.

4. A vibratory plow as in claim 1 wherein said support assembly includes side plate means partially enclosing said driving assembly in supported relation thereto, a pivot rod arranged in interconnecting relation to the upper portion of both said support assembly and said yoke assembly.

5. A vibratory plow as in claim I wherein said yoke assembly comprises channel plates movably connected to both of said support means and said driving assembly, a tunnel forming assembly connected to said yoke assembly in ground engaging relation thereto when said yoke is arranged in operative position.

6. A vibratory plow as in claim 5 wherein said support means includes side plate means arranged to extend in substantially parallel relation along the length of said channel plate, a pivot rod fixedly attached to said side plates and movably connected to said channel plates such that said yoke is partially attached to said support means.

7. A vibratory plow as in claim 1 further comprising a tunnel forming assembly fixedly connected to said yoke assembly and comprising a bullet member, a blade means interconnecting said bullet and said yoke assembly.

8. A vibratory plow as in claim 7 wherein said tunnel forming assembly is removably attached to said yoke assembly by means of mounting jaw means and tapered mount attached to said yoke assembly and said tunnel forming assembly in cooperative relation to one another.

9. A vibratory plow as in claim 7 further comprising connecting means adapted to attach cable means being pulled by said plow to said tunnel forming member; said connecting means comprising a stud having a cavity formed therein, a transversing member movably arranged within said cavity, a connection member connected to said cable means being pulled and a pin rigidly interconnecting said transverse member and said connection member such that said connection member is movably connected to said tunnel forming assembly.

10. A vibratory plow as in claim 9 wherein said bullet is removably attached to said stud.

l l. A vibratory plow as in claim 7 further comprising connecting means adapted to attach cable means to said plow; said connecting means comprising conduit means arranged on said plow in cooperation with said tunnel fonning assembly so as to channel cable means being pulled by said plow from above ground into said tunnel thus formed.

12. A vibratory plow as in claim ll wherein said conduit means is connected to said yoke assembly and arranged to extend substantially along the length of said tunnel forming assembly whereby said cable means is directed along the length of said tunnel forming means and into said tunnel is a substantially continuous manner.

13. A vibratory plow as in claim 1 wherein said mounting shaft includes a hollow portion such that said mounting shaft is telescopically arranged relative to a mounting boom of the prime mover. 

1. A vibratory plow attachable to the prime mover comprising, a mounting shaft, a drive assembly support means, a drive assembly connected to said mounting shaft by said support means, main driving means operatively interconnecting said drive assembly to the power takeoff of the prime mover, a yoke assembly pivotally mounted to said drive assembly support means, said drive assembly comprising a main drive shaft attached in driven relation to said main driving means, an eccentric drive shaft movably connected to said yoke assembly by a shaft connecting means, said shaft connecting means rotatably connected to said eccentric shaft and positioned in contiguous relation to said yoke assembly so as to be disposed in movable engagement therewith, whereby rotation of said eccentric shaft causes movement of said yoke assembly, said main drive shaft arranged in driving interconnecting relation between said main driving means and said eccentric shaft, said shaft connecting means disposed in interconnecting relation between said eccentric shaft and said yoke assembly, whereby said yoke assembly oscillates in a substantially horizontal direction upon activation of said drive assembly.
 2. A vibratory plow as in claim 1 wherein said main driving means includes a drive Chain, said drive assembly comprises roller sprocket wheel means connected to both said main drive shaft and eccentric drive shaft, connection means interconnecting in driving relation cooperating rollers sprocket wheel means of each drive shaft, whereby said yoke assembly is driven in reciprocal fashion by said drive chain through said main drive shaft and said eccentric drive shaft.
 3. A vibratory plow as in claim 2 further comprising a main drive sprocket fixedly mounted on said main drive shaft and connected in direct driving relation to said drive chain such that said yoke assembly is driven in reciprocal fashion by said eccentric drive shaft.
 4. A vibratory plow as in claim 1 wherein said support assembly includes side plate means partially enclosing said driving assembly in supported relation thereto, a pivot rod arranged in interconnecting relation to the upper portion of both said support assembly and said yoke assembly.
 5. A vibratory plow as in claim 1 wherein said yoke assembly comprises channel plates movably connected to both of said support means and said driving assembly, a tunnel forming assembly connected to said yoke assembly in ground engaging relation thereto when said yoke is arranged in operative position.
 6. A vibratory plow as in claim 5 wherein said support means includes side plate means arranged to extend in substantially parallel relation along the length of said channel plate, a pivot rod fixedly attached to said side plates and movably connected to said channel plates such that said yoke is partially attached to said support means.
 7. A vibratory plow as in claim 1 further comprising a tunnel forming assembly fixedly connected to said yoke assembly and comprising a bullet member, a blade means interconnecting said bullet and said yoke assembly.
 8. A vibratory plow as in claim 7 wherein said tunnel forming assembly is removably attached to said yoke assembly by means of mounting jaw means and tapered mount attached to said yoke assembly and said tunnel forming assembly in cooperative relation to one another.
 9. A vibratory plow as in claim 7 further comprising connecting means adapted to attach cable means being pulled by said plow to said tunnel forming member; said connecting means comprising a stud having a cavity formed therein, a transversing member movably arranged within said cavity, a connection member connected to said cable means being pulled and a pin rigidly interconnecting said transverse member and said connection member such that said connection member is movably connected to said tunnel forming assembly.
 10. A vibratory plow as in claim 9 wherein said bullet is removably attached to said stud.
 11. A vibratory plow as in claim 7 further comprising connecting means adapted to attach cable means to said plow; said connecting means comprising conduit means arranged on said plow in cooperation with said tunnel forming assembly so as to channel cable means being pulled by said plow from above ground into said tunnel thus formed.
 12. A vibratory plow as in claim 11 wherein said conduit means is connected to said yoke assembly and arranged to extend substantially along the length of said tunnel forming assembly whereby said cable means is directed along the length of said tunnel forming means and into said tunnel is a substantially continuous manner.
 13. A vibratory plow as in claim 1 wherein said mounting shaft includes a hollow portion such that said mounting shaft is telescopically arranged relative to a mounting boom of the prime mover. 